[iPhone開發 ]打印日誌公共類

#ifdef DEBUG
#  define LOG(fmt, ...)\
do {                                            \
    NSString* file = [[NSString alloc] initWithFormat:@"%s", __FILE__]; \
    NSLog((@"%@|%s|(%d)| " fmt), \
    [file lastPathComponent], \
    __func__, \
    __LINE__, \
    ##__VA_ARGS__ \
    ); \
    [file release];                                                 \
} while(0)
#  define LOG_METHOD NSLog(@"%s", __func__)
#  define LOG_CMETHOD NSLog(@"%@/%@", NSStringFromClass([self class]), NSStringFromSelector(_cmd))
#  define COUNT(p) NSLog(@"%s(%d): count = %d\n", __func__, __LINE__, [p retainCount]);
#  define LOG_TRACE(x) do {printf x; putchar('\n'); fflush(stdout);} while (0)
#else
#  define LOG(...)
#  define LOG_METHOD
#  define LOG_CMETHOD
#  define COUNT(p)
#  define LOG_TRACE(x)
#endif